Explain how Darwin’s observations during his 5-year voyage on the Beagle led him to change
his mind about the fixity of species. What will be an ideal response?
Fossils of mammals Darwin collected in South America were similar to modern llamas, sloths,
and armadillos, but also differed from them. Darwin also observed 13 species of finches living
on the Galapagos Islands, and he postulated that they evolved from a single species now living
on South America’s Pacific Coast. Darwin suggested that these organisms adapted to changing
environmental conditions in much the same way that humans for millennia had introduced
desirable characteristics into breeds of domesticated plants and animals by artificial selection.
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In a lifetime, an average American citizen will consume ________ pounds of mineral and fuel resources.
A. 3.5 million B. 6,500 C. 450,000 D. 55,000
Of the following, which soil type has the highest field capacity?
A) Loam B) Silt loam C) Clay loam D) Sandy loam
A ridge of sand that connects an island to the mainland or to another island is a(n) ________
Fill in the blank(s) with correct word
Major deposits of silicous oozes from the radiolaria are found centered on which latitudes?
A. 30°N and S B. 5°N C. 65°N and S D. 20°N and S E. 45°N and S